.center{
  width: 100%;
  margin: 0 auto;
  max-width: 1400px;
  min-width: 1200px;
}
*{padding: 0;margin: 0;}
a{
  text-decoration: none;
}
ul,ol,li{
  list-style: none;
}
.scenarios, .advantage, .service-case, .service, .news, .partner 
{
padding: 96px 18px;
margin: 0 auto;
}
.main-item:nth-child(odd){
  background-color: #f7f8fa;
}